29 Oct
2015
29 Oct
'15
11:22 a.m.
On 2015-10-29 18:44, Noel Chiappa wrote:
The Massbus connector is similar, but about three times the size.
Yuk. :-)
I certainly seem to remember that some machines had a rather different
interface than the Micro-ODT one, but maybe they were all various early
Unibus-machines. Can't remember for sure. I tried to stay away from
machines that had the serial console interface to the hardware. I prefer
front panels. :-)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
From: Ben
Sinclair
the bc80m cable .. which I believe is a ribbon
type of connector with a
ground strap on one end, then a round cable to the berg connector for
the back of the RL02. I think it's the cable pictured here:
http://www.cosam.org/computers/dec/pdp11-23/20080403.html
Yes, that's the cable. But there's no ribbon cable anywhere in it: the
individual wires from the round cable go directly to the Berg (aka Du Pont)
female connector, which plugs into the male Berg header on the board.
The other end does not have a Berg connector, it's some sort of wierd-ass
connector that I don't know the proper name for. (The RK0[67] also uses them,
and I think maybe the MASSBUS too?) Early
revisions only supported 18 bit addressing, but later models
supported 22 bit addressing. But how that is reflected in the micro-ODT
on a KDF-11 I don't know.
I already bitched about this! Although it supports Q22 _on the bus_, their
ODT only supports Q18. There's no way to fiddle with high memory, except
via program! I don't
even know if it's actually micro-ODT, or some more primitive
console mode on that CPU.
AFAIK, it's the same ODT as all the other QBUS -11's (03, 73, etc - although
the /03 has the 'L' bootloader command that none of the others do, along with
a couple of other odd minor ones like '@').